Establishments primarily engaged in fabricating iron and steel or other metal for structural purposes, such as bridges, buildings, and sections for ships, boats, and barges. Establishments primarily engaged in manufacturing metal doors, sash, frames, molding, and trim are classified in Industry 3442; and establishments doing fabrication work at the site of construction are classified in Division C, Construction.
- Barge sections, prefabricated metal
- Boat sections, prefabricated metal
- Expansion joints (structural shapes): iron and steel
- Floor jacks, metal
- Floor posts, adjustable: metal
- Gates, dam: metal plate
- Highway bridge sections, prefabricated metal
- Joists, open web steel: long-span series
- Radio and television tower sections, prefabricated metal
- Railway bridge sections, prefabricated metal
- Ship sections, prefabricated metal
- Steel joists, open web: long-span series
- Steel railroad car racks (for transporting motor vehicles fabricated)
- Structural steel, fabricated
- Tower sections, transmission: prefabricated metal